Power-operated dirigible spotlight having a single driving motor



March 1"], 1953 J H CONE 2,632,097

POWER-OPERATED D-IRI'GIBLE SPOTLIGHT HAVING A SINGLE DRIVING MOTOR 2 SHEETS-SHEET 1 Filed April 22, 1949 as 20 f} R Imfififi) l j I, In

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Snventor Joseph H Cor1e W M W Gttomegs March 17, 1953 CONE 2,632,097

J- H. POWER-OPERATED DIRIGIBLE SPOTLIGHT HAVING A SINGLE DRIVING MOTOR Filed April 22. 1949 2 SHEETS-SHEET 2 Q 63 65 53 6Q X 5| 7 53 I 57 Zhwemor 5 .]0se,b71 H C07 Gttomegs Patented Mar. 17, 1953 UNITED STATES POWER-OPERATED DIRIGIBLE SPOTLIGHT HAVING A SINGLE DRIVING MOTOR Joseph H. Cone, Bridgeport, Conn., assignor to Casco Products Corporation, Bridgeport, Conn., a corporation of Connecticut Application April 22, 1949, Serial No. 88,972

12 Claims. 1

This invention relates to remote-controlled power-operated dirigible spotlights of the type commonly installed on automobiles, having a spot-light unit or lamp head mounted for turning about two non-parallel axes to obtain universal movement and therefore a wide angle or range of coverage.

One object of the invention is to provide an improved remote-controlled power-operated dirigible spotlight of the type mentioned, which has relatively few, inexpensive parts and is of simple and economical construction.

Another object of the invention is to provide an improved dirigible spotlight as above characterized, which may be very easily and accurately aimed or directed by an operator, without requiring the exercise of any considerable degree of skill.

A further and important object of the invention is to provide an improved power-operated, remote-controlled dirigible spotlight in accordance with the foregoing, wherein the lamp head or light unit when not being adjusted is held securely locked in position and prevented from shifting out of said position due to vibration,

movement of the vehicle on which it is mounted, etc.

Still another object of the invention is to provide an electrically-controlled dirigible spotlight in accordance with the above, which is charac terized by relatively few lead wires or connections between the spotlight and the control switch therefor.

A further object of the invention is to provide an improved dirigible spotlight having the fcrecordance with the invention, a lamp head or light unit mounted for turning about two nonparallel axes whereby an extremely large field or wide range of coverage is attained, and provide a motor and pair of drive mechanisms between the motor and light unit for turning the latter about the said axes respectively. One of said mechanisms preferably is permanently operative. In conjunction with this structure I provide means under the control of an operator for rendering the other of said drive mechanisms either operative or inoperative, and provide means operable in coniunction with said lastnamed means, for effecting reversal of th motor for either the operative or inoperative condi,

tion of said other drive mechanisms.

When both drive mechanisms are operative and the motor is turning in either direction, the turning of the light unit about one of its axes will be halted because of its rotation about the other axis. When the other drive mechanism is rendered inoperative, the operation of the permanently-operative drive mechanism will result in a turning of the spot-light unit about said one axis. Thus rotation about either axis may be effected independently of rotation about the other axis, and such rotation may be in either of opposite directions, depending on whether the motor is operating forward or in reverse. In consequence I have found that the aiming and directing of the spotlight may be very easily and quickly ffected, even by one possessing a minimum amount of skill.

In the embodiment of the invention illustrated herein the drive mechanism rendered operative or inoperative includes a solenoid-operated clutch mechanism. The motor, to provide for reversibility, has a pair of field coils either one of which may be energized. By utilizing ground connections to the frame of the spotlight, and by interconnecting the solenoid and motor in a particular manner, I have found it possible to effect complete control and operation of the spotlight with no more than four lead wires extending between the light and the control switch, which latter is normally located at a remote point.

The drive mechanisms of the spotlight comprise bevel gears, spur gears and worm gearing, so arranged that the various parts are extremely compact and the overall structure relatively small and not unpleasing in appearance. The parts are moreover few in number and of simple structure whereby a desirable economy of manufacture is attained.

The employment of a single, positive-type clutch, and of worm, spur and bevel gearing results in a sturdy construction which makes for reliability in operation.

Irreversible worm drives are provided in each drive mechanism, permanently connected with the lamp head whereby the latter is locked in any adjusted position when not being driven.

Other features and advantages will hereinafter appear.

In the drawings:

Figure 1 is a vertical sectional view through the improved spotlight of the invention, the lamp head being shown in part only.

Fig. 2 is a horizontal sectional view taken on line 2-2 of Fig. 1.

Fig. 3 is a vertical sectional view taken on line 33 of Fig. 2.

Fig. 4 is a fragmentary sectional view of a portion of the drive mechanism shown in Fig. 2, the clutch of the mechanism being disengaged, and

the engaged position of the clutch gear being indicated by a broken outline.

Fig. 5 is a schematic circuit diagram of the improved spotlight and control means thereof.

Fig. 6 is a horizontal sectional View through one type of control switch for the spotlight.

Fig. 7 is a view partly in elevation and partly in vertical section, through the switch of Fig. 6.

Fig. 8 is a view partly in section and partly in elevation, taken on line 88 of Fig. 6; and

Fig. 9 is a front elevational view of another type of control switch for the spotlight.

Referring to Figs. 1 through 3, the improved spotlight of the invention comprises a casing ID having an upper part II in the form of an inverted hollow member, and having a lower part l2 comprising an upright hollow member, the said parts engaging each other along edges Ma and I20. respectively and constituting an enclosure for the power and driving mechanisms of the spotlight.

Preferably the casing part I I has integral with it a mounting plate or bracket l3 whereby it may be secured to a supporting surface, as the side of an automobile body. Opposite the mounting plate l3 the casing part II has a tubular extension I4 rotatably carrying a shaft which mounts an elbow-shaped fitting IS on which is journaled a lamp head H.

The lamp head l1, also herein termed a spotlight unit, may comprise a shell I8 carrying a reflector l9 and an electric bulb 2D. The shell l8 may be mounted on a shaft 2| which is rotatable in the elbow fitting l6 whereby the lamp head [1 is rotatable about an axis XX angularly disposed with relation to the axis YY of the shaft I5.

The inner end of the shaft 2| mounts a bevel gear 22 which meshes with a second bevel gear 23 carried on a shaft 24 passing through the shaft [5. Shafts 24 and [5 which are relatively movable, have in common the axis YY, and shaft I5 is as mentioned before, rotatable in the tubular extension l4 of the casing [0.

For the purpose of driving the shafts 2|, l5 and 24, the latter two shafts have spur gears 25 and 26 respectively, meshing with pinions 21 and 28. Referring to Figs. 2 and 3, the pinions 21 and 28 are carried on shafts 29 and 30 which in turn carry worm wheels 3l and 32 meshing with worms 33 and 34 mounted on a common shaft 35, the worm 33 being loose on the shaft and the Worm 34 rigid with the shaft as shown in Fig. 4.

At its center the shaft 35 carries a worm wheel 36 meshing with a worm 31 on shaft 38 of an electric motor 39 carried in the lower casing part I 2 of the spotlight, Fig. 1. As seen in Fig. 4 the worm 33 is rigidly secured to a spur gear 40, which at all times meshes with a cooperable spur gear 4! rotatable on a shaft 42. The shaft 35 has rigidly secured to it adjacent the spur gear 40 a second and similar spur gear 43 which can also mesh with the gear 4!. The spur gears 40, 4| and 43 constitute a clutch device, the gear 4| being axially slidable on the shaft 42 and being controlled by a collar 44 and arm 45 connected to a plunger 46 and core 4'! of a solenoid 48. A compression spring 49 normally yieldably holds the core 4'! and plun er 45 in the position shown in Fig. 2 wherein the gear 44 does not mesh with the gear 43. For this position, the ear 40 and worm 33 are not driven when the motor 38 is energized and operated. If, however, the solenoid 48 should be energized, this 4 will attract the core 41 and shift the gear M to the dotted-line position A shown in Fig. 4 wherein it will mesh with both the gears 40 and 43. As a consequence, the motor 39 will drive the worm 33.

It will be noted that when the solenoid 48 is not energized, energization of the motor 33 will result in driving of only the shafts 24 and 2|, causing turning of the lamp head I"! about the axis X-X. When the solenoid 48 is energized, operation of the motor 39 will cause rotation of not only the shafts 24 and 2! but also the shaft I5, causing a turning of the lamp head ll about the axis YY. For this latter condition, when both the drive mechanisms are operative, rotation of the lamp head I! about the axis XX will cease for the reason that the shaft 24 will be driven in the same direction and have the same speed as the shaft Hi. There will thus be no relative movement between shafts 24 and I5 and the bevel gears 22 and 23 will not rotate with respect to the elbow fitting [5, nor will the lamp head I! turn about the axis X-X. In this connection it is pointed out that, for the dotted-line position of the gear 4| shown in Fig. 4, the pinions 2'! and 28 will rotate in the same directions and at the same speeds, and will drive the spur gears 25 and 26 both in the same directions and at the same speeds. The ratios between the said pinions and gears are made equal.

I have found that with the above organization, merely controlling the solenoid 48 and the direction of rotation of the motor 39 will cause the lamp head or light unit I! to be turned in either of reverse directions about either one of the axes XX or Y-Y independently of the other. Thus, by such control of the solenoid and motor, an operator may from a remote point very easily and quickly, and with a minimum amount of skill, direct the beam of light from the bulb 20 to any desired spot, this being accomplished with but a single clutch device, and with simple and sturdy gearing which is reliable in its operation. Moreover, I have provided in each of the drive mechanisms for turning the lamp head I! about the axes XX and Y-Y a double worm reduction, resulting in a highly advantageous turn ratio between the motor shaft 38 and lamp head. This avoids undue load on the motor 39 and provides for a relatively slow turning movement of the lamp head, which prevents inadvertent overshooting of the mark or objective,

The worm drives comprising the worms 33 and 34 are irreversible, so that the lamp head IT is held locked in any adjusted position; therefore it will. not tend to swing downward or change position due to vibration or movement of the vehicle on which the spotlight is mounted. This makes it unnecessary to employ auxiliary frictional means to hold the lamp head in adjusted position, which means would be undesirable from the standpoint of the added expense as well as the added load imposed on the drive motor.

For the purpose of controlling the operation of the solenoid 48 and motor 39 a multi-position switch 53 is provided, Figs. 5 through 8. This switch comp-rises a tubular shell 5| adapted to be mounted on an instrument panel 52, the rear end of the shell carrying an insulating base 53 on which are mounted cooperable pairs of contacts 54, 55 and 55, 5?, the said contacts being in the form of leaf springs and the pairs being located on opposite sides of the axis of the shell 51, extending along the inside of the shell. The

insulating base 53 also carries pairs of leaf sprin contacts 58, 59 and 60, 61 extending into the shell on opposite sides of the axis. As shown in Fig. 7 the axial plane through the contacts 54 to 58 is at right angles to the axial plane through the contacts 58 to 88.

The switch 58 further comprises an elongate manually-operable electrically-conducting member 82 extending along the axis of the shell 5! between the pairs of contacts carried by the base 53. The inner end of the member 62 mounts a ball 53 carried in a socket '64 secured to a plunger 65 which is axially slidable in the base 53. The outer end of the plunger 65 carries a detent fitting 68 cooperable with a coil spring 61 having the shape of an annulus, which is held captive in a cage 68 secured to the base 53.

The member 82 mounts a knob 59 at its other end, and is axially movable together with the plunger 85 between the inoperative position shown in Fig. 6 to an operative position attained by shifting the member and plunger to the left. as viewed in this figure, until the detent spring 51 snaps to the other side of the fitting 66. The member 62 carries insulating collars Ill and H, and metallic conducting collars I2 and 13 which are electrically connected together through the member. For the inoperative position of Figs. 6 and 7 the insulating collars Hi and H are in position to engage the leaf spring contacts as indicated; when the member 62 is shifted to the left to operative position, the conducting collars i2 and E3 take the places of the insulating collars of H! and H and are cooperable with the said leaf springs.

At its forward end the shell 5| carries an escutcheon member M having a cruciform opening 15, and having helical coil springs l6 extending into the said opening and normally centralizing the member 62 in the opening.

The circuit diagram of the spotlight and control means therefor is shown in Fig. 5. The various parts of the control switch 58 are shown located within a broken rectangular outline 58a. The spot-light bulb 28 has one terminal grounded and the other connected by a wire 1! to an on-ofi switch 18 which is in turn connected by a wire 79 with the switch contact 5|. The pposite switch contact 59 is connected by a wire I 88 with a battery 8| which has its other terminal grounded.

The motor 39 has an armature 82 connected to ground through a wire 83. The motor also has field coils 84 and 85 provided with a common connection which is connected by a wire 85 with the armature 82. The remaining terminal of the field coil 84 is connected by a wire 81 with switch contacts 54 and 58; the remaining terminal of the field coil 85 is connected by a wire 88 with switch contacts 68 and 55. Switch contacts 55 and are connected together, and by a wire 89 with one end of the solenoid 48 the other end of which is grounded. A jumper 98 is shown connecting together the two portions of the manually operable member 82 which are illustrated diagrammatically in Fig. 5.

Operation of the improved spotlight of the invention is as follows: When the switch 58 is in the inoperative position shown in Figs. 6 and 7, the circuit leading from the battery 8! will remain open. For this condition, actuation of the manually operable member 52 either up or down, or to one side or the other, will not cause operation of the spotlight. If, from the position of Fig. 6, the knob 69 of the member 62 (and the member) should be pulled outward or to theleft to operative position, this will cause the contacts 59 and 6| to be bridged by the conducting collar I3. Assuming that the switch 18 is closed, this will result in energization of the bulb 20. If now the knob 69 should be shifted upward as viewed in Fig. 6 (corresponding to moving it to the left when the switch is mounted on the instrument panel) this will cause the collar 12 to engage the leaf spring contact 58, and will result in energization of the field coil 84 and armature B2 of the motor 39, causing the motor to operate in one direction. Such operation will cause the pinion 28 to drive the spur gear 26 and cause turning of the shafts 24 and 2| of the lamp, resulting in a turning of the lamp head I! about the axis XX. If the knob 69 should be moved in the opposite direction or downward as viewed in Fig. 6 (to the right when the switch 50 is mounted on the instrument panel 52) then the leaf spring contact 60 will be energized, causing energization of the motor field coil and armature 82, and causing a reverse rotation of the motor 39. This will result in the lamp head I! turning in a reverse direction about the axis XX.

Referring to Fig. '7, if the switch member 62 is moved upward it will result in the collar 12 engaging the leaf spring 55 and also result in engagement of the latter with the leaf spring 51. This will cause energization of the motor field coil 84 and of the solenoid 48, the latter being the first to be energized. The clutch gear 4| will immediately be shifted to the position of Fig. 4 and then the motor 39 operated, whereupon both of the shafts I5 and 24 of the spotlight will be turned at the same speed and in the same direction. This will cause the lamp head I! to turn about the axis Y-Y, but will not cause the lamp head to turn about the axis XX. If the switch member 62 should be shifted downward as viewed in Fig. 7, connection will be established between the collar i2 and the leaf springs 58 and 51, causing ener ization of the motor field 85 and the solenoid 48, and this will cause a reverse turning movement of the lamp head I? about axis YY. After completion of use of the spotlight, the light unit I! may be returned to any desired storage position by shifting the knob 69 either up or down or to one side or the other, and the light may then be extinguished by pushing the knob inward to restore the switch parts to the position of Fig. 6.

In certain circumstances it may be found desirable to aim or direct the spotlight without the bulb 28 being energized; to accomplish this it is merely necessary, according to the above organization, to open the switch 18.

Another form of control switch for operating the spotlight is illustrated in Fig. 9. Four switch buttons 90, 9!, 92 and 93, having the letters L, D, R and U respectively, are mounted on a plate 98 at the center of which an on-off switch 95 is carried. The buttons 98 and 92 are disposed respectively to the left and right of the switch 95, and the buttons 8! and 98 disposed respectively below and above the switch 95.

The on-off switch 95 may be connected to the wires 79 and 88 in the circuit of Fig. 5. The

buttons 90 and 92 actuate switch contacts (not shown) which may be connected to the wires 8'! and 88. The switch buttons 9! and 93 actuate contacts (also not shown) which may be connected to the wires 8'l, 88 and 89, all in the manner clearly illustrated in Fig. 5 whereby pressing of any one button so, 9|, 9201 93 will control the lamp head I? in the same manner as actuation of the switch knob 69 in the direction corresponding to location of the button.

Variations and modifications may be made within the scope of this invention and portions of the improvements may be used without others.

I claim:

1. In an electrically-controlled dirisible spotlight of the type having a metal. casing, an elecric motor in the casing, a lamp head including an electric bulb, mounted on the casing and driv n by the motor, said head being movable about two non-parallel axes and being permanently geared to the motor for adjustment about one axis, and said spotlight having a solenoid in the casing, controlling disengageable gearing between the motor and lamp head to efiect adjustment of the head about the other axis Without changing adjustment about the one axis, the improvement which comprises providing a circuit therefor including ground connections between the casing. electric bulb, motor armature, and the solenoid; a pair of field coils in said motor, havin a common connection which is joined with the ungrounded side of the armature; and separate leads from the unconnected sides of the solenoid, field coils, and electric bulb, passing out of the casing whereby a potential applied between the casing and individual leads or combinations of said leads will efiect energization of the electric bulb, operation of the motor in forward or reverse directions, and gear connections between the motor and lamp head to provide adjustment of the latter about either of said axes.

2. In an electrically-controlled dirigible spotlight of the type having a metal casing, an electric motor in the casing, a lamp head in eluding an electric bulb, mounted on the casing and driven by the motor, said head being movable about two non-parallel axes and being permanently geared to the motor for adjustment about one axis, and said spotlight having a solenoid in the casing, controlling disengageable gearing between the motor and lamp head to effect adjustment of the head about the other axis without changing adjustment about the one axis, the improvement which comprises providing a circuit therefor including ground connections between the casing, electric bulb, motor armature, and the solenoid; a pair of field coils in said motor, having a common connection which is joined with the ungrounded side of the armature; separate leads from the unconnected sides of the solenoid, field coils, and electric bulb, passing out of the casing; and selectively operable switch means to provide for connection of a potential first between the casing and electric bulb lead, and thereafter either between the casing and one or the other of the motor field leads, or between the casing and the solenoid lead and then between the casing and one or the other of the motor field leads.

3. In an electrically-controlled dirigible spotlight of the type having a metal casing, an electric motor in the casing, a lamp head including an electric bulb mounted on the casing and driven by the motor, said head being movable about two non-parallel axes and being permanently geared to the motor for adjustment about 0 -e axis, and said spotlight having a solenoid in the casing, controlling disengageable gearing between the motor and lamp head to efiect adjustment of the head about the other axis without changing adjustment about the one axis,

the improvement which comprises providing a. circuit therefor including ground connections between the casing, electric bulb, motor armature, and the solenoid; a pair of field coils in said motor, having a common connection which is joined with the ungrounded side of the armature; separate leads from the unconnected sides of the solenoid, field coils, and electric bulb, passing out of the casing; and selectively operable switch means to provide for connection of a potential between the casing and electric bulb lead, and either between the casing and one or the other of the motor field leads or between the casing and solenoid lead and one or the other of the motor field leads.

4. A dirigible spotlight comprising a spot-light unit and means for supporting the same for rotation about two axes at an angle to each other; a reversible motor; and mechanism for moving said spot-light unit, including gear means permanently connecting the unit to said motor to be moved in either direction thereby to provide a permanent drive therebetween for rotating said spot-light unit about one axis, and second gear means separate from the first gear means connecting said unit to said motor to move the unit about the other axis, said second gear means including means optionally actuated to cause said second gear means to be rendered operative to inove the unit about said other axis.

5. A dirigible spotlight comprising a spot-light unit and means for supporting the same for rotation about two axes at an angle to each other; a. reversible motor; and mechanism for moving said spot-light unit, including gear means permanently connecting the unit to said motor to be moved in either direction thereby to provide a permanent drive therebetween for rotating said spot-light unit about one axis, and second gear means separate from the first gear means connecting said unit to said motor to move the unit about the other axis, said second gear means including means normally disconnecting the drive between the unit and motor and manually operable means optionally actuated to cause said second gear means to be connected to the motor to move the unit about said other axis.

6. A dirigible spotlight comprising a spot-light unit and means for supporting the same for rotation about two axes at an angle to each other; a reversible motor; and mechanism for moving said spot-light unit, including gear means permanently connecting the unit to said motor to be moved in ither direction thereby to provide a permanent drive therebetween {or rotating said spot-light unit about one axis, and second gear means separate from the first gear means connecting said unit to said motor to move the unit about the other axis, said second gear means including means optionally actuated to cause said second gear means to be rendered operative to move the unit about said other axis, each of said gear means including an irreversible gear means permanently connected to the unit whereby the unit is locked in any adjusted position when not being driven.

'7. A dirigible spotlight comprising a spot-light unit and means for supporting the same for rotation about two axes at an angle to each other: a reversible motor; mechanism for moving said spot-light unit, including gear means permanently connecting the unit to said motor to be moved in either direction thereby to provide a permanent drive therebetween for rotating said spot-light unit about one axis, and second gear means separate from the first gear means connecting said unit to said motor to move the unit about the other axis, said second gear means including means optionally actuated to cause said second gear means to be rendered operative to move the unit about said other axis; and means connected to said motor and to said second gear means for controlling the movement of the unit including a device actuatable by an operator in the senses left, right, up and down, the left and right movement controlling the direction of rotation of said motor and movement of the unit by the first gear means about said one axis and the up and down movement controlling direction of rotation of said motor and operation of said second gear means to move the unit about said other axis.

8. A dirigible spotlight comprising a spot-light unit and means for supporting the same for rotation about two axes at an angle to each other; a reversible motor; mechanism for moving said spot-light unit, including gear means permanently connecting the unit to said motor to be moved in either direction thereby to provide a permanent drive therebetween for rotating said spot-light unit about one axis, and second gear means separate from the first gear means connecting said unit to said motor to move unit about the other axis, said second gear means including i .eans optionally actuated to cause said second gear means to be rendered operative to move the unit about said other axis; and means connected to said motor and to said second gear means for controlling the movement of the unit including a device actuatable by an operator in the opposite senses, the movement of the device in one sense controlling the direction of rotation of said motor and movement of the unit by the first gear means about said one axis and the movement of the device in the opposite sense controlling direction of rotation of said motor and operation of said second gear means to move the unit about said other axis.

9. A dirigible spotlight comprising a spot-light unit and means for supporting the same for rotation about two axes at an angle to each other; a reversible motor; and mechanism for moving said spot-light unit, comprising first gear means including angularly related gears respectively rtatable about said axes and permanently connecting the unit to said motor to be moved in either direction thereby to provide a permanent drive therebetween for rotating said spot-light unit about one axis, and second gear means separate from the first gear means connecting said unit to said motor to move the unit about the other axis, said second gear means including means optionally actuated to cause said second gear means to be rendered operative to simultaneously drive the unit from said motor to move the unit about said other axis, the ratio between the first and second gear means causing movement of the unit about the one axis to cease during the simultaneous operation of the second gear means to move the unit about said second axis.

10. A dirigible spotlight comprising a casing; an elbow rotatable on the casing about a substantially horizontal axis; a lamp head carried by the elbow and rotatable thereon about an axis nonparallel with said horizontal axis; mounting means for securing the casing to a support; a reversible electric motor carried by the casing between said elbow and mounting means; drive means connecting the lamp head and motor to form a permanent drive therebetween for rotating the lamp head with respect to the elbow; gear means connecting the elbow to the motor to simultaneously drive the elbow from the motor for rotation about said horizontal axis, said gear means having a ratio with respect to said drive means connecting the lamp head to the motor that rotation of the lamp head with respect to the elbow ceases regardless of the direction of turning of the motor and including means for breaking the driving connection between the elbow and motor; means under the control of an operator for rendering operative or inoperative the means breaking the driving connection in the gear means; and means under the control or the operator, for reversing said motor.

11. A dirigible spotlight comprising a casing; an elbow rotatable on the casing about a substantially horizontal axis; a lamp head carried by the elbow and rotatable thereon about an axis non-parallel with said horizontal axis; mounting means for securing the casing to a support; a reversible electric motor carried by the casing between said elbow and mounting means; drive means connecting the lamp head and motor to form a permanent drive therebetween for rotating the lamp head ith respect to the elbow; gear means connecting the elbow to the motor to simultaneously drive the elbow from the motor for rotation about said horizontal axis, said gear means having a ratio with respect to said drive means that rotation 01 the lamp head with respect to the elbow ceases regardless of the direction of turning of the motor and including clutch means for breaking the driving connection between the elbow and motor; and remote control means connected to said motor and clutch means for rendering operative or inoperative the clutch means and for controlling the direction of rotation of said motor.

12. A dirigible spotlight comprising a casing; an elbow rotatable on the casing about a substantially horizontal axis; a lamp head caried by the elbow and rotatable thereon about an axis nonparallel with said horizontal axis; mounting means for securing the casing to a support; a reversible electric motor carried by the casing between said elbow and mounting means; drive means connecting the lamp head and motor to form a permanent drive therebetween for rotating the lamp head with respect to the elbow; gear means connecting the elbow to the motor to simultaneously drive the elbow from the motor for rotation about said horizontal axis, said gear means having a ratio with respect to said drive means that rotation of the lamp head with respect to the elbow ceases regardless of the direction of turning of the motor and including a disengageable gear for breaking the driving connection between the elbow and motor and means for moving said gear; and means under the control of an operator for rendering said disengageable gear operative or inoperative to drive the elbow from said motor.

JOSEPH H. CONE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,257,141 Snowdon Feb. 19, 1918 1,491,377 Calhoun Apr. 22, 1924 1,641,167 Hannig Sept. 6, 1927 1,743,224 Macy Jan. 14, 1930 1,987,438 French Jan. 8, 1935 

